Some people keep lists obsessively, but whether or not you're a serious list-maker, productivity weblog Lifehack.org suggests nine lists that are a must to keep updated and handy—no matter who you are.

At the top of their list, "Things I Want" is a perfect example of a list that they say needs to be kept up-to-date and readily accessible.

Every year, people I know ask me what I want for my birthday, or for Christmas, or just because they love giving me gifts (that last would be nice, huh?). Usually, I have no idea what to tell them. That's why I've started keeping a list of things I want — every time I hear about or come across something I'd like to have, no matter how big or small, it goes on my list.

If I get it, or don't want it anymore, it goes away. It's simple, but having this list gives me a running tally of stuff I actually want, so I'm not just telling my family and friends "anything's great, seriously…" and then pretending to like what I get.

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Starting and keeping a list isn't too difficult, of course; it's keeping it updated and on hand that proves to be the challenge. There's nothing like getting to the store only to find you've left the grocery list on the kitchen counter, and nothing's much worse than having a few free minutes, the motivation to knock out some tasks, but no To-Do list handy.

Other suggested lists include: Got A Minute, "Watch, Read, Listen," BHAGs ("Big Hairy Audacious Goals"), Bucket List, Don't Forget, Great Ideas, and Grocery List. Some seem more necessary than others, and if you're a die-hard GTDer, you'll notice some overlap with a few of the GTD lists.

When it comes to personal productivity (and especially list-making), we take a to-each-her-own approach, so whether or not you agree with Lifehack.org's nine lists, we want to hear what lists you're serious about. If you've got a tactic for keeping your lists handy or a suggestion for another list that you can't live without, let us know in the comments.